A koi died on me today and I found long red worms in the filter mud. What are they and how can I rid of them?

Question

Anyway..forgot I have more space here.. The worms are about 3/8th inch or roughly 10mm long and are a deep red. I see them especially in the filter and all this summer I assumed they were plant debris, but one attached to me today . So how can I get rid of them in the fish and pond? The pond is only 100 gallons and we have about 10 4-7 inch goldfish and koi all doing very well except the one.

Answer 1

we call them wrigglies usually smaller fish eat them they are like blood worms that you buy at your pet store get a few guppies and mollies (adults) they love them even chinese algae eaters the all go well out side in the warmer weather i had them in an old bath tub outside with they same type of worm you decribed i think the koi died of something else

Answer 2

What is a Koi, some type of fish? it sounds as if they are either poisoning the fish water or bloodsucking on the fish like a parasite. I would  contact your local veterinary service, take a specimen of the worm and get then to identify it for you. Have a great day.

Answer 3

they are blood worms, don't worry it is a sign that you have a nice clean fish pond . Also u will find the fish will be readily eating them.